Oscillations and waves

A force of  30 N stretches a very light ideal spring 0.73 m from equilibrium. What is the force constant (spring constant) of the spring?

• 41 N/m
• 22 N/m
• 34 N/m
• 46 N/m

A pair of trapeze performers at the circus is swinging from ropes attached to a large elevated platform. Suppose that the performers can be treated as a simple pendulum with a length of 16 m. Determine the period for one complete back and forth cycle.

• 2 sec
• 12 sec
• 8 sec
• 10 sec

Which would have the longest period?

Pendulum A: A 200-g mass attached to a 1.0-m length string

Pendulum B: A 400-g mass attached to a 0.5-m length string

• A

• B

• Same

A pendulum is 0.75 meters long and has a period of 4.17 seconds. The Pendulum is on an unknown planet. What is the acceleration due to gravity at the surface of the Unknown Planet?

• 9.8

• 3.4

• 1.7

• Greater than 9.8

What kind of wave can travel through space?

• electromagnetic waves
• compressional waves
• transverse waves
• longitudinal waves

A wave carries...?

• energy only
• matter only
• the matter carries the energy
• neither

A mass attached to a spring vibrates back and forth. At the equilibrium position, the

• acceleration reaches a maximum.
• velocity reaches a maximum.
• net force reaches a maximum.
• velocity reaches zero.

By what factor should the length of a simple pendulum be changed in order to triple the period of vibration?

• 3
• 6
• 9
• 27

Suppose that a pendulum has a period of 4.0 s at Earth’s surface. If the pendulum is taken to the moon, where the acceleration due to gravity is much less than on Earth, will the pendulum’s period increase, decrease, or stay the same?

• Increase

• Decrease

• Stays the same

• Need more information

A certain pendulum with a 1.00 kg bob has a period of 3.50 s. What will happen to the period of the pendulum if the 1.00 kg bob is replaced by a bob with a mass of 2.00 kg?

• Increase
• Decrease
• Stays the same
• Need more information